1996 Roadmaster Twilight no rear tail light

I have a 96 roadmaster with twilight sentinal. It will auto turn on the head lights, but the inst. panel & tail lights won't come on automatically. Brake lights work. If use the manual head lights switch, the panel lights & tail lights work. I have checked the module, both relays work. I have checked all fuses in the left column with an VOM,. I think it is a loose connection or relay because at first, when they didn't work, it was intermittent. Some times worked then didn't work, if it was a fuse I don't think it would be intermitent. It's not that I can't pull on the light switch to be able to drive, it's just there & I would like to have it work right. I took it to a dealer, asked the service manager, he looked at it scatched his head. He said that they could dig around & find it, never seen one like that. I thought for $70 plus a hour, I wasn't it that big of a rush! Thanks

I found it today. I realized that I was going on a 4000 mile road and I really wanted it to work. I went to my bone yard to try to find some replacement parts. After I got over the culture shock & the fact he didn't have any of them. We looked up the drawing on his all-data machine and I went home started with my VOM. I found a cold solder joint on a relay on the control module mounted in the right pillar. At first, I thought it was the contact on the relay, but when I shorted across the contact on the conponent side of board, & it still didn't work. It had be scatching my head, then looked harder at solder connections. BINGO!